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I made it open-source initially with the idea of collaboration. Since nothing in that regard came to fruition, I prefer to not have the burden of it being open-source.

But the idea of open source is not only collaboration. It is also about transparency.
People could get the idea that apps can artificially be pushed upwards in the list.

This still wouldn't prove that I'm not running different code than the one open-sourced.

While when it is closed source you do it and it is "okay" if it is open source and you run different code, that would be a special level of sneakyness =D